Active Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface Assisted Multi-user Security Communication with Coupled Phase Shift
Passive intelligent reflecting surfaces hold great potential in enhancing wireless communication systems and improving physical layer security,but they suffer from significant drawbacks such as"double fading"and partial coverage.Therefore,an active Simultaneously Transmitting And Reflecting Reconfigurable Intelligent Surface(STAR-RIS)is conducted in this paper.Considering the coupling between reflection and transmission phase shifts,a joint optimization problem for maximizing the security energy efficiency of base station beams and active STAR-RIS beams is formulated.To solve the resulting non-convex optimization problem,continuous convex approximation,penalty function method,semi-definite relaxation,and alternating optimization techniques are employed to transform the original problem into a convex one.Additionally,a penalty dual decomposition algorithm is proposed.Simulation results validate the effectiveness of the algorithm proposed in this paper.
万方数据
维普
